More old works sent up (5)
I believe the answer is:
extra
'more' is the definition.
(I've seen this in other clues)
'old works sent up' is the wordplay.
'old' becomes 'ex' (prefix meaning former or onetime).
'works' becomes 'art' (I've seen this before).
'sent up' is a reversal indicator.
'art' back-to-front is 'tra'.
'ex'+'tra'='EXTRA'
(Other definitions for extra that I've seen before include "Bit actor in crowd scene" , "An increased amount" , "Bit actor in film" , "Bye or wide, for example" , "eg Wide; additional" .)